I used to feel the same; dc are adults now.
The weekend is long and hard with such young dc. But it’s much, much harder for you if your dh works on Saturdays op. My dh used to be away travelling a lot and I remember really resenting the weekends in sole control of dc when he wasn’t there.
I came to the counter-intuitive conclusion that part of the reasons my weekends were so stressful was that I gave up the rigid routine that governed the rest of the week in the hope that we. could chill a bit but that often doesn’t work with under fives but it does start to get masses better once they are eight.
And lying in and having slower mornings sounds so inviting but in actual fact is hell with infants who wake early.
So I used to draw up a plan for Saturday and Sunday.
Up early for at least one parent (take it in turns) but much more fun if both of you.
Slightly slower breakfast and then reading on the sofa.
Then out to a class or activity run by someone else so dh and me could have a peaceful coffee, or if not a walk in a park for all of us.
Supermarket delivery on Thursdays so food all planned and prepped for weekends which is boring but takes away a lot of stress. Dc used to do better when lunch was their main meal at that age.
After food and exercise, dc more willing to chill a bit and at that point one parent can nap if needed.
Afternoons set up a craft activity. Pre-prepared and thought about. Or made dens with duvet cover . Big cardboard boxes made in to houses.
Then tea for dc, early bath, reading again and bed followed by takeaway and video for me and dh.
Sundays, pretty much the same but would go to a museum or gallery or Stately home or something. Or cycling with dc on board.
Really boring and rigid and I found it very hard at times if I’m honest but nothing else worked with ours as they were physically very active and energetic.
Very occasionally we would hire a baby sitter for three hours one WE morning and dh and I would go and do our own thing. She would take them out somewhere. Would that be an option op?
Parties were a fun interruption if I was organised with generic present and wrapping paper etc and a bit of a pain if not!
And of course there were weekends where one of us was ill or we just didn’t or couldn’t stick to schedule but we found it more manageable when we did.
It’s particularly gruelling if you work ft
I was really lucky to work pt during that period so I had time mid-week when I basically lay on the floor.
Could your dh try and make a real effort to get home from work early on Friday Op and be in charge of entertaining the dc and having a chill evening with a takeaway? That way at least you get to decompress a bit at the start of the weekend marathon?